Description:

Emacs-X11 includes the Emacs text editor program for use with the X
Window System (it provides support for the mouse and other GUI
elements). Emacs-X11 will also run Emacs outside of X, but it has a
larger memory footprint than the 'non-X' Emacs package (emacs-nox).

Install emacs-X11 if you're going to use Emacs with the X Window
System. You should also install emacs-X11 if you're going to run Emacs
both with and without X (it will work fine both ways). You'll also
need to install the emacs-common package in order to run Emacs.